At low speed, it tends to buck every 3-5 seconds. It is almost in a rhythm when it happens. Then I accelerate and it stops.

I notice that when it happens, I am very light on the gas, barely pressing the accelerator. Maybe it is the drive by wire acting up? I am not 100% sure on the history of the car. I know the previous owner kept up the maintenance fairly well according to all of the records in a VIN check. Wish me luck. I will let you know what happens after I have the tranny serviced. I see no leaks under the car right now. I will also have them scan the car for codes.